A nurse is caring for an adolescent who is having a sickle cell crisis. Which of the following nursing actions should the nurse take?

A. Blood transfusions may be necessary during a sickle cell crisis to reduce the proportion of sickled cells, improve oxygen-carrying capacity, and prevent complications such as stroke. B. Fluid restriction is contraindicated; patients should receive adequate hydration to help prevent sickling. C. Opioids should not be withheld; pain management is a priority during a sickle cell crisis. D. Strenuous exercise is not recommended during a crisis as it can exacerbate hypoxia and sickling.